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(No Model.)

J. C. GORAMQ 2 Sheets- -Sheet 1.

VISH.-

Patented July 17, 1883.

I .all Ll I l lmm\ l///////////////////////l (No Model.) V 2Sheets-Sheet 2.

J. G. CORAM..

- VISE. No. 281,463. Patented July 17, 1883.

A h u 'llllllll llllllllllllll 1 Hllllllllllllll By@ M\ UNITED STATE-s*PATEN T OFFICE.

` JOHN c. CORAM, OF LWELL, MASSACHUSETTS, ASSIGNOR OF' ONE-HALF roGEORGE B. CORAM, OF SAME PLACE.

VISE.

SPECIFICATION forming part of Letters Patent No. 281,463, dat-,ed July17, 1883.

Application filed June 11, 1883.

,vis'es in which the movable jaw, free to slide toward or away from thefiXed jaw so as to quickly adjust it to any size of material to behe-ld, is combined with means which, while permitting this freelysliding movement of preliminary adjustment, will act, after theadjustment is obtained, to further and powerfully draw the movable jawtoward the fixed jaws, so as to tighten the grip upon the thing to beheld.

The invention consists ina certain novel combination and arrangement ofdevices for this purpose, which can best be explained and nnderstood byreference to the accompanying drawings, in which- Figure 1 is a sideelevation of a vise embodying my improvements. Fig. 2 is alongitudinalvertical central section of the same. Fig. 3 is a transverse verticalsection on line 3'3. Fig. 1.

The parallcl vise' shown in the drawings is of the treadle type. Thefaces of the jaws of the vise are adapted for wood-working but the visecan be readily adapted for metal-V working by suitably changing the formof the jaws, as will be understood without further explanationby thoseskilled in the art to which this invention relates.

The treadle-lever is shown at A. It is pivoted at a to any suitablebase-piece, and is provided with a tooth or detent, b, to work inconnection with a stationary ratchet, B, as usual in this class ofvises, whereby it can be held in the position to which it may bedepressed at its front end in closing the j aws together. The rear endof the treadle-lever is weighted or is combined with a downwardly-'pulling spring, so that its front end will be thrown up when releasedfrom the control of the retaining-ratchet B.

The jaws of the vise are lettered C D. In the present instance the innerjaw, C, is a stationary jaw, and the outer j aw, D, is the freelyslidingmovable jaw. The outer jaw, D, has

(No model.)

ahorizontal shank, D', which fits and is adaptedto slide in a tubularguidesocket in a case, C'. Upon the under face of the shank or bar D'are formed ratchet-teeth c, and through an opening in the bottom of thecase C', near its front end, works a pawl, d, which is pivoted to apawl-level', E, hung on a horizontal pivot, e, between downwardlyprojccting cars c 011 'the front of case C'. The free end of the pawlmust be guidedso that during its recipro catory movement its acting faceshall alternately and at the proper time be held up into engagement withratchet-bar D', and be removed from engagement therewth. A convenientarrangement for this purpose is found in the pins e', which projectlaterally from the pawl and enter and move in guide slots or grooves f,formed in the sides of the case CC These grooves or slots at the frontand for a portion of their length slope downwardly, so that when thepawl is retracted the pins e', following these inclined portions of theslots, will draw down the acting end of the pawl out of engagement withthe ratchet-bar D', as indicated by dotted lines in Fg. 2, thus leavingthe bar D' and its j aw D free to slide in either direction. The slotsfor the remainder of their length are horizontal, so that when the pawlmoves in the opposite direction it will, by the time the pins reach thetop of the inclined part of the slots, be raised into engagement withthe ratchet-bar 'D', and will, by reason of the pins traveling along thehorizontal part of the slots, be maintained in engagement with saidratchet-bar, thus carrying the latter along with it during the rest ofits movement. Under this arrangement Ihave a pivoted pawl which ispositively actuated and guided in all its movements, thus insuring greatcertainty of operation; and these parts, as well as the ratchet, are onthe under side of the bar D', thus removing danger of the teeth or otherparts of this portion of the mechanism becoming clogged or fouled bydirt or other rcfuse.

The pawl-lever E is operated through the instrumentality of a toggle, F,pivotedat one end to lever E and at the other end to some stationarypart of the device, as at g, and connected at its knuckle or elbow by aconnecting-rod, G, to the rear end of the treadle-lever. By theemployment of the pawl-lover E IOO and the combination the'ewith of thetoggle F under the arrangement indicated, a Very powerful clampingaction of the vise is obtained, the power applied to the foot-1ever or 5treadle being transmitted under conditions which insu'e the bestresults. It will, moreove', be noted that the rear end or arm of thefoot 01' treadle level' is upwardly bent or cu-ved, and is so formed andarranged that IO the end of this arm, when the treadle is depressed, isin a vertical plane very close to that of the plane of the axis a of theIGVGP, as

indieated by full lines in Fig. 2, thus materially increasing at thistime the leverage of the I 5 treadle and gaining additional power nearthe conclusion of the clamping movement of the jaws, which is ofmaterial advantage.

Having now described my invention and the manner in which the same is ormay be carried into efl'ect, I state in conclusion Ido not broadly claima freely-sliding movable Vise-j aw in combination with a toggle andmeans through the intermediary of which said jaw is forced by saidtoggle up toward the stationary jaw; but

hat I claim as new and of my own invention is 1. The conbination,substantially as hereinbcfore set forth, with the stationa-y jaw, thefreely-sliding` movable jaw, and its ratchet shank or bar, of thepivoted pawl-leve', the

pivoted pawl ca'ried by said level', and means,

substantially as described, whe'cby said pawl is positively actnated andguided independently of the ratchct-shank in its reciprocato'y movementsto alternately and at the proper times engage and quit the saidratchet-shank.

2. The combination, with the sliding i'atchetsha'nk of the movable jaw,of the positively actuated and guided pawl for engaging the same, thepivoted pawl-ear'ying level', the toggle, the treadle-lever, and the 'odconnecting the treadle-lever with the toggle, these elements beingarranged and adapted to coope'ate substantially in the mane' and fo' thepurposes hereinbefore set forth.

3. The combination of the stationary jaw, the movable jaw and itsratchet-shank, the guide-case supporting said shank, the paw1- leve' andthe pawl carried by said lever, and

provided with laterally-projecting pins to enter and move in guide Slots01' g'ooves in said case, said Slots or g'ooves being fol-med,substantially as described, to lift and lower the pawl into and out ofengagement with the ratchet-shank at the times and in the mannersubstantially as he'einbefore set forth.

In testinony whereof I have he'eunto set my hand this 6th day of June,1883.

JOHN C. CORAM. XVitnesses F. ILIILGORE, A. J. CIIAPMAN.

